<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script>
	function css(obj,name,value){
		if(arguments.length==2){
			return obj.style[name]; //获取
		}
		else{
			obj.style[name]=value;
		}
	}
	window.onload=function(){
		var oDiv=document.getElementById('div1');
		css(oDiv,'background','green');
	}
</script>
</head>

<body>
<div id="div1" style="width:200px; height:200px; background:red;">
</div>
</body>
</html>
